GB615536A - Improvements in frequency discriminators - Google Patents

Improvements in frequency discriminators

Info

Publication number
GB615536A
GB615536A GB28436/45A GB2843645A GB615536A GB 615536 A GB615536 A GB 615536A GB 28436/45 A GB28436/45 A GB 28436/45A GB 2843645 A GB2843645 A GB 2843645A GB 615536 A GB615536 A GB 615536A
Authority
GB
United Kingdom
Prior art keywords
frequency
oct
resistor
capacitor
pass filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB28436/45A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB615536A publication Critical patent/GB615536A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

615,536. Frequency modulation; automatic tuning correction. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 27, 1945, No. 28436. Convention date, Oct. 27,1944. [Class 40 (v)] In a frequency discriminator a resistor R1 and capacitor C1 are connected across the input to act as a low-pass filter, resistor R2 and capacitor C2 serving as a high-pass filter, the filters having a desired cross-over frequency. The outputs of the filters feed over diodes 3, 4, load resistors 7, 10 to produce an A.F.C. voltage for a superheterodyne receiver or the circuit may be employed as a detector in a receiver for angle modulated waves. The reactance of the capacitors is chosen equal to the resistance of the resistors at the cross-over frequency.
GB28436/45A 1944-10-27 1945-10-27 Improvements in frequency discriminators Expired GB615536A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US615536XA 1944-10-27 1944-10-27

Publications (1)

Publication Number Publication Date
GB615536A true GB615536A (en) 1949-01-07

Family

ID=22036505

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28436/45A Expired GB615536A (en) 1944-10-27 1945-10-27 Improvements in frequency discriminators

Country Status (1)

Country Link
GB (1) GB615536A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076940A (en) * 1957-01-29 1963-02-05 Gilfillan Bros Inc Frequency discriminator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076940A (en) * 1957-01-29 1963-02-05 Gilfillan Bros Inc Frequency discriminator

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